<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>我的个人OJ系统</title>
    <style>
        /* Reset default styles */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* Global styles */
        body {
            font-family: Arial, sans-serif;
            line-height: 1.6;
        }

        /* Header styles */
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: #333;
            color: #fff;
            padding: 10px 20px;
        }

        .navbar a {
            color: #fff;
            text-decoration: none;
            padding: 10px;
            transition: background-color 0.3s ease;
        }

        .navbar a:hover {
            background-color: #555;
        }

        /* Main content styles */
        .container {
            max-width: 1200px;
            margin: 20px auto;
            padding: 0 20px;
            text-align: center;
        }

        .container h1 {
            margin-bottom: 20px;
            font-size: 2em; /* Increased font size for heading */
        }

        .container p {
            margin-bottom: 30px;
            color: #555;
            font-size: 1.2em; /* Increased font size for paragraph */
        }

        .container a {
            display: inline-block;
            padding: 10px 20px;
            background-color: #007bff;
            color: #fff;
            text-decoration: none;
            border-radius: 5px;
            transition: background-color 0.3s ease;
        }

        .container a:hover {
            background-color: #0056b3;
        }

        /* Responsive styles */
        @media screen and (max-width: 768px) {
            .navbar {
                flex-direction: column;
                align-items: flex-start;
            }

            .navbar a {
                padding: 10px 0;
                display: block;
            }

            .container {
                padding: 0 10px;
            }
        }
    </style>
</head>
<body>
    <header class="navbar">
        <nav>
            <a href="/">首页</a>
            <a href="/all_questions">题库</a>
            <a href="#">竞赛</a>
            <a href="#">讨论</a>
            <a href="#">求职</a>
        </nav>
        <a class="login" href="#">登录</a>
    </header>
    <main class="container">
        <h1>欢迎来到我的OnlineJudge平台</h1>
        <p>这个我个人独立开发的一个在线OJ平台</p>
        <a href="/all_questions">点击我开始编程啦!</a>
    </main>
</body>
</html>
